Electric time-alarm



(No Model.) I

' a H.'P. SUMMER.

- ELEGTEIG TIME ALARM. I

No. 518,971. I Patented May 1,1894.

om/wt I UNITED STATES PATENT OFFICE.

HENRY P. SOMMER, OF CHICAGO, ILLINOIS.

ELECTRIC TIME-ALARM.

SPECIFICATION forming part of Letters Patent No. 518,971, dated May1,1894.

Application filed May 1, 1893. fierial No. 472,462- (No model.)

To all whom it may concern:

Be it known that I, HENRY PETERSON SOM- MER, a citizen of the UnitedStates, residing at Chicago, in the county of Cook and State ofIllinois, have invented a new and useful Improvementin ElectricSignal-Alarms, of which the following is a specification.

My invention relates to signals wherein a dial is used with a revolvingindicator, such as pressure gages, thermometers with dials, clocks, &c.,and is here shown on a clock especially designed to alarm at a desiredinterval of minutes, for use in cooking eggs, and the invention consistsin the mechanical devices set forth in the claim hereof.

Reference will be had to the accompanying drawings, in which- Figure 1is a front elevation. Fig. 2 is a side sectional view showing the clock,and the electrical connections thereto.

In the drawings, A designates a back board or block, to which the wholedevice is fastened, and it is preferably fixed to the wall like a clock.To this board A, there is hung a clock B, on a screw B, and to the baseA, there is "also fixed an electric bell F, with the ordinary bindingposts F and F From the binding post F there is an electrical conductorconnecting the screw B and from the binding post F an electricalconductor runs to F of a switch E, and from the point D of the switch E,a conductor runs to a binding post D and from this runs a conductor to abattery D. In the center of the glass of the dial there is a holedrilled, into which there is pivoted a pointer O, with a thumb piece 0.This pointer O has its outer end bent downward to intercept the end ofthe minute hand b of the clock.

Fixed into the bed A at O is a Wire with its end 0 springing in contactwith the thumb piece 0. From the Wire 0 an electrical conductor extendsto a binding post 0 which in turn is connected to the battery D. Whenthe pointer C is not in contact with the hand 1), the circuit of thebattery is open, as the pointer O is insulated from the body of theclock by the glass dial plate 0 But when the hand b comes in contactwith the pointer C, and carries it with it, the current passes throughthe pointer and through the clock, and to the screw B, and hence to thebell F, which rings the alarm.

In cooking eggs, the pointer C is set the required number of minutes inadvance of the minute hand, and at the expiration of the time thecontact of the hand b and pointer 0 takes place, and closes the circuitand the bell rings. When not in use the switch E is opened, and theminute hand 1) carries the pointer O with it throughout its movement. Itis obvious that the indicator hand of a pressure gage or a thermometerwill act in the same way, thereby giving the alarm at the arrival atsome desired point.

What I claim is- An electric signal alarm for the purpose describedhaving the back A. an electric annunciatorF.aswitchE. connected to saidannunciator F. screw B supporting the gage or clock B. and electricallyconnected to annunciator F. the pointer O pivoted to the glass andprovided with a thumb piece 0 the wire 0 fixed in the backA andextending up outside the clock B and in contact with the thumb piece'Oby the springing action of the wire, said switch E and wire 0 connectedto the poles of an electric battery substantially as shown.

In witness whereof I have hereunto subscribed my name in the presence oftwo witnesses.

. H. P. SOMMER.

Witnesses:

S. M. BROWN, J. O. HEIMBACH.

